1643740473460 has 96 divisors (see below), whose sum is σ = 3562421990400. Its totient is φ = 636687528960.

The previous prime is 1643740473433. The next prime is 1643740473497. The reversal of 1643740473460 is 643740473461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87801981 + ... + 87820699.

It is an arithmetic number, because the mean of its divisors is an integer number (37108562400).

Almost surely, 2^{1643740473460} is an apocalyptic number.

1643740473460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1643740473460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1781210995200).

1643740473460 is an abundant number, since it is smaller than the sum of its proper divisors (1918681516940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1643740473460 is a wasteful number, since it uses less digits than its factorization.

1643740473460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19561 (or 19559 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 49.

Subtracting from 1643740473460 its reverse (643740473461), we obtain a palindrome (999999999999).

The spelling of 1643740473460 in words is "one trillion, six hundred forty-three billion, seven hundred forty million, four hundred seventy-three thousand, four hundred sixty".